1. The mean weight of a large group of people is 180 lb and the standard deviation is 15 lb. If the weights are normally distributed, ?nd the probability that a person picked at random from the group will weigh
(a) between 160 and 180 lb,
(b) above 200 lb,
(c) below 150 lb.
2. The IQs of army volunteers in a given year are normally distributed with µ ¼ 110 and a ¼ 10. The army wants to give advanced training to the 25% of those recruits with the highest IQ scores. What is the lowest IQ score acceptable for the advanced training?